gbe_fork/cmake/share/cmake-3.27/Help/envvar/CXX.rst

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CXX
---
.. include:: ENV_VAR.txt
Preferred executable for compiling ``CXX`` language files. Will only be used by
CMake on the first configuration to determine ``CXX`` compiler, after which the
value for ``CXX`` is stored in the cache as
:variable:`CMAKE_CXX_COMPILER <CMAKE_<LANG>_COMPILER>`. For any configuration
run (including the first), the environment variable will be ignored if the
:variable:`CMAKE_CXX_COMPILER <CMAKE_<LANG>_COMPILER>` variable is defined.
.. note::
Options that are required to make the compiler work correctly can be included;
they can not be changed.
.. code-block:: console
$ export CXX="custom-compiler --arg1 --arg2"